NK(2) antagonists have been reported to be potentially useful for the treatment of a number of chronic diseases, such as asthma, irritable bowel syndrome, cystitis, and depression. Starting from an in-house prepared library of capped dipeptides, we have identified a series of molecules with subnanomolar binding affinity for the hNK(2) receptor. These molecules are composed by three well-defined regions: a planar aromatic acyl system as N-terminal capping group, a rigid and quite lipophilic core, and a flexible and relatively hydrophilic C-terminal capping group. Here we report how we were able to manipulate the N-terminal capping group to obtain significant in vivo activity after i.v. and i.d. administration.
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